Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 520, NWS Norman, OK

October 12, 2021Alfalfa County, Major County, Woods County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 12, 2021, 1:42 PM CDT for Alfalfa County, Major County, Woods County, Oklahoma. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Oct 12, 2021, 1:42 PM CDT (18:42 UTC)
Expired: Oct 12, 2021, 2:30 PM CDT
In force: 48 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Alfalfa County, OK, Major County, OK, Woods County, OK

The radar

The Vance AFB radar (KVNX), 32 km from the middle of the area, began a volume at 18:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Dodge City, (KDDC), launched 12:00Z, 6.7 hours before the alert went out and 170 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1890 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 276 m²/s²
0-3 km storm-relative helicity: 277 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

299 
WUUS54 KOUN 121842
SVROUN
OKC003-093-151-121930-
/O.NEW.KOUN.SV.W.0520.211012T1842Z-211012T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
142 PM CDT Tue Oct 12 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Eastern Woods County in northwestern Oklahoma...
  Western Alfalfa County in northwestern Oklahoma...
  Central Major County in northwestern Oklahoma...

* Until 230 PM CDT.

* At 142 PM CDT, a severe thunderstorm was located 9 miles northwest
  of Orienta, moving north at 55 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Alva, Cherokee, Carmen, Burlington, Dacoma, Lambert, Ingersoll,
  Driftwood, Capron and Hopeton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3700 9827 3631 9854 3635 9874 3700 9861
TIME...MOT...LOC 1842Z 193DEG 47KT 3644 9861 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

11

2 follow-up statements

109 
WWUS54 KOUN 121903
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
203 PM CDT Tue Oct 12 2021

OKC093-121912-
/O.CAN.KOUN.SV.W.0520.000000T0000Z-211012T1930Z/
Major OK-
203 PM CDT Tue Oct 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MAJOR COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3700 9827 3663 9846 3667 9864 3700 9861
TIME...MOT...LOC 1902Z 192DEG 51KT 3675 9852 

$$

OKC003-151-121930-
/O.CON.KOUN.SV.W.0520.000000T0000Z-211012T1930Z/
Woods OK-Alfalfa OK-
203 PM CDT Tue Oct 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM CDT
FOR NORTHEASTERN WOODS AND NORTHWESTERN ALFALFA COUNTIES...

At 202 PM CDT, a severe thunderstorm was located 6 miles north of
Dacoma, moving north at 60 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Burlington, Dacoma, Driftwood, Ingersoll and Capron. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3700 9827 3663 9846 3667 9864 3700 9861
TIME...MOT...LOC 1902Z 192DEG 51KT 3675 9852 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

11

681 
WWUS54 KOUN 121917
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
217 PM CDT Tue Oct 12 2021

OKC151-121926-
/O.CAN.KOUN.SV.W.0520.000000T0000Z-211012T1930Z/
Woods OK-
217 PM CDT Tue Oct 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WOODS COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3700 9827 3682 9837 3682 9852 3700 9853
TIME...MOT...LOC 1916Z 195DEG 48KT 3695 9842 

$$

OKC003-121930-
/O.CON.KOUN.SV.W.0520.000000T0000Z-211012T1930Z/
Alfalfa OK-
217 PM CDT Tue Oct 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM CDT
FOR NORTHWESTERN ALFALFA COUNTY...

At 216 PM CDT, a severe thunderstorm was located near Burlington,
moving north at 55 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Burlington and Driftwood. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3700 9827 3682 9837 3682 9852 3700 9853
TIME...MOT...LOC 1916Z 195DEG 48KT 3695 9842 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

11

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 12, 10:46 AM CDT	Flood Watch	OUN	Atoka, Bryan, Coal, Johnston, Love, Marshall	41 hr
Oct 12, 12:36 PM CDT	Special Weather Statement	OUN	Alfalfa	24 min
Oct 12, 12:42 PM CDT	Special Weather Statement	OUN	Caddo	33 min
Oct 12, 1:08 PM CDT	Special Weather Statement	OUN	Canadian	37 min
Oct 12, 1:09 PM CDT	Special Weather Statement	OUN	Major	36 min
Oct 12, 1:28 PM CDT	Special Weather Statement	OUN	Alfalfa	17 min
Oct 12, 1:35 PM CDT	Special Weather Statement	OUN	Major	25 min
Oct 12, 1:46 PM CDT	Special Weather Statement	OUN	Canadian	29 min
Oct 12, 1:50 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan	40 min
Oct 12, 2:33 PM CDT	Special Weather Statement	OUN	Logan	27 min
Oct 12, 3:03 PM CDT	Special Weather Statement	OUN	Noble	42 min
Oct 12, 3:42 PM CDT	Special Weather Statement	OUN	Kay	33 min
Oct 12, 4:14 PM CDT	Special Weather Statement	OUN	Kay	31 min
Oct 12, 5:03 PM CDT	Special Weather Statement	OUN	Harmon	27 min
Oct 12, 5:26 PM CDT	Special Weather Statement	OUN	Greer	34 min
Oct 12, 5:37 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon	38 min
Oct 12, 6:14 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills, Washita	46 min
Oct 12, 6:18 PM CDT	Tornado Warning	OUN	Beckham, Greer, Kiowa, Washita	42 min
Oct 12, 6:21 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	39 min
Oct 12, 6:51 PM CDT	Tornado Warning	OUN	Beckham, Custer, Washita	24 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.